I went and filled the truck up this morning. Trip odo from yesterday's trip was 338.8 miles. Truck took 18.1 gallons of fuel, that calculates out to 18.71 mpg. The overhead said 19.8, so it's a little over 1 mpg off.

Still, I'm happy. 08 truck, haven't touched a thing on it. Only thing I'm not 100% on is what gearing it came with, @ 65 on the highway it's around 1600 rpm, I'm sure someone can tell what gearing that is by the speed and rpm.

 

More than likely you have 3.73s.... That's about the same rpms I turn at that speed

 

That's what I figured they had to be. Shouldn't really matter for the use that the truck will see. Att hsi point I'm pulling about a dozen times a year, about 200 to 400 mile round trips with a single open car trailer that weigh's about 5000 lbs with the car, next trailer will be a 26 foot enclosed, taht will probably come in around 9500 to 10000 lbs, still shouldn't be a big deal.

 

With 2000 mi. Brother said he got 19.1 at 75 mph--- Alot better than my LMM !!!!